John Wiley & Sons, 2004
Buku Teks
Guetzkow, Harold
Prentice-Hall, 1972
Buku Teks
edited by S.E. Jorgensen, B. Halling-Sorensen, S.N. Nielsen
Lewis Publishers, 1996
Buku Referensi
Ulrich Langer, Martin Schanz, Olaf Steinbach, Wolfgang L. Wendland, editors
[Springer, ], 2012
eBooks
Ford, Andrew
Island Press, 1999
Buku Teks